熱処理によるビッカース圧こんの変化について : 押込硬度の圧こんについて第2報

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The authors previously noticed on the depression in case of measuring hardness, that the Vickers depression had some piling-up even in diagonal direction, which is believed to have little piling-up. The Vickers hardness is measured by the surface area of depression caloulated from the diagonal length of square depression, so if the degree of piling-up differs, the influence of measuring error in the hardness number will be different. In this paper, the change of the piling-up caused by the heat-treatment of materials are examined as a help for obtaining the inquiring data of the measuring error of Vickers hardness. Five sorts of the carbon steel and two sorts of the brass are heat-treated and depressed by Vickers indentator, and the surface of depression are traced by the Ogoshi Surface Roughness Tester (contact needle type). Some of the results are summarized as follows : (1) The degree of piling-up is much affected by the heat-treatment in both materials. (2) The change of the degree agrees with the change of Vickers hardness in case of carbon steels, but does not always agrees with the hardness in that of brass. (3) The degree of piling-up varies by 200%, in case of carbon steel, and by 100%, in that of brass according to the rise of tempering temperature, if the quenching value is taken as standard. These degrees have a great influence on the hardness number. (4) As the ratio of the major diagonal of Knoop depression to the minor diagonal is in the lever relation to the degree of piling-up. One rising, the other falling, so we may easily obtain the general trend of the piling-up.
社団法人日本材料学会の論文
1957-08-15

熱処理によるビッカース圧こんの変化について : 押込硬度の圧こんについて第2報

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熱処理によるビッカース圧こんの変化について : 押込硬度の圧こんについて 第2報

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熱処理によるビッカース圧こんの変化について : 押込硬度の圧こんについて第2報